You're welcome
(And no I don't understand Icelandic, Finnish nor Chinese. Only English, Swedish, Norwegian and Danish. So I used Google translate and LINE Dict Chinese - English to translate the others)

As a Finn I can understand Sweden pretty well so that's why I was able to understand most of this comic.
After all I went throw some old comments to be sure to have correct translations and made summary about what they are saying.

First screen:
Sweden: I've been wondering, why do you have a fish on your head?
Norway: So that my hands are free.
Sweden: That's stupid.

Second screen:
Sweden: To have a fish on the head makes as much sense as to have a boat on the head.
Norway: A boat? Why would you have a boat on your head?

Third screen:
Denmark: Hi guys! Can I join you?
Sweden: Why do you have a city on your head? It has nothing to do with a sea.
Denmark: Yes it does! It's a sunken city!

Fourth screen:
Finland: Are you trying to mock my hat?
Sweden: No Finland. You always think that everybody is making fun of you.
Norway: What?
Denmark: What did he say?

PANEL ONE
Sweden: Why do you have a fish on your head?
Norway: This way my hands are free.
Sweden: That's stupid.

PANEL TWO
Sweden: Having a fish on your head makes as much sense as a boat on MY head.
Norway: A boat? Why would you have a boat on your head?

PANEL THREE
Denmark: Hey guys! Can I hang out with you?
Sweden: Why do you have a city on your head? It has nothing to do with the ocean.
Denmark: Yes it does! It's a sunken city!

PANEL FOUR
*Finland says something* (Normally it wouldn't be translated, so I didn't translate this)
Sweden: No Finland. You always think everything is about you.
Norway: What?
Denmark: What did he say?

So does this mean that Finland talks without the aid of saunas but we just lose it in translation? Also, does Humon think her comics are a big hit with americans and chinese people? Because as both, I love them